Automatic stopping device



June 23, .1925. 1,542,878

R.' HILDEBRAND AUTOMATIC STOPPING DEVICE F11-ed Lafon 14. 1921 2 sheets-sheet 1 @wma mCQwl/ June 23, 1925. 1,542,878

R. HILDEBRAND Auroux'nc s'rorrne DEvIcn Filed Harsh 14 1921 2 Sheets-Sheet 2 Patented June 23, 1925.

@UNITED STATES PATENToFI-jljca REINHARD HILDRBRAND, OF lWEBSTER GROv'ns, MISSOURI, ASSIGNoR'ro FULTON IRON WORKS COMPANY, or s'I. LOUIS, MISSOURI, A CORPORATION or nRInWrIRVR. f

/ AUTOMATIC STO'PPING DEVICE.

Application filed March 14, 1921Q Serial No. 452,303.

To all whom t may concern;

Beit known that I, REINHARD IIILDR- BRAND, a citizen of'Grermany, vand a resident of IVebster Groves, in the county of St. Lo-uis and State of Missouri, have invented certain new andy useful Improvements in yAutomatic Stop-ping Devices, of whichv the followingis a full, clear, and exacty description',V reference being' 'had' to the accompanying.1drawingsforming a part of vthis specification. v

"This invention relates to improvements in automatic stopping devices adapted Ato stop a motor, or a pump, one o-f the objects being toprovide an automatic device for stopping a pump in Aresponse to high and low pressures. In a pumping system, the pressure' will become dangerously high when the discharge line leading from the plumpis accidentallyclosed by a valve or some other obstruction, ,and Aa very great lreduction in the pressure may result from leakage in the discharge line. The auto- .lnatic stopping device herein disclosed is especially adapted lfor use witha very-large lpump-,for forcing oil through a'large pipe line. If'the discharge vline is closed for any reason, :the Vpressure at the puinpvwill rise and the automatic device Vwill then Stop the pump. Gr, if there is undue leakage inthe discharge line, such as may be caused by breakage ofthe roil conducting pipe," there will be avery material reduction in lthe iuid pressure,-and the automatic device will then stop the pump; It will thus be' seen that the pump is automatically stopped in response to Van undesirable high pressure, and that l'it is also` stopped i-nresponse to a vsubstantial reduction in the pressure,-.so

as to minimize the expense and danger of forcing oil through a leak in the pipe line.

Another yObject is to provide an automatic stopping device including anoperatingmember actuated by fluid pressure, and means for preventing vundue vibration of the operating member, thereby stabilizing the operating means. l I v .I/Vith theforegoing and other objects in view, the invention; comprises :the novel construction, combination andarrangement of parts hereinafter 'more specifically described andillustrated in theaccompanying drawings wherein is shown the preferred embodiment. ofthe invention.. However, it is to be understood'that the invention'comprehends changes, variations and modifica-4 tions which come within the scope of the claims hereunto appended.

Fig. I is a diagramma-tical view illustrating an engine and a pump equipped with anautomatic stopping device embody-A ing the features of this invention.

. Fig. II is' an enlarged vertical section taken approximately on the line II-II, Fig LV- -f f Fig. III is an enlarged detailview illustrating the fluid actuated thrust member through which motion is transmitted to an operating lever. y y v Fig. IV isa horizontal section taken approximately on the Vline IV-f-IV,VFig. V.2 l.Fig. V is a side elevation, partly in section, showing the operating means for the automatic stopping device.

A' designates a pump (Fig. I) provided with a. discharge pipe 1 through which fluid under pressure is forced from the pump. The pump includesa cylinder 2 provided with a p iston 3. adapted to be actuated by an lengine B. The engine herein shown includes a` cylinder 4.-, and a power shaft 5 provided with a cranki 6. 7 designates -a connecting rodw'hereby the crank 6 is secured toy a lcrojssheadv 8, the latter beingY vided withv an inlet lpipe 11 (Fig. I) .for the Y admission of fuel to the engine cylinder. A

valve 12, located in the fuel pipe 11, may be closedfto discontinue the delivery of fuel lto the engine. This valve is to be considered as a suitable means j for stoppingthe engine, thereby stopping the pump, and said valve is provided with an operating handle 13 whichis operatedi automatically, as will be hereafter described.

The means for operating the valve 12 includes alever 14 (Fig. I) fulcrumed at 15 and connected to the valve handle 13 through the vmedium of a link 16. A vertical operating rod 17 is secured to one end of the lever 14, said rod 17 being slidably mounted in guides 18, shown in Fig. II. A collar 19 is fixed to the-rod 17 (Fig. II) and a compression sp-ring 2O is interposed between the collar 19 an'done of the guides 18. This spring tends to move the operating rod 17 in. a Vdownward fdlirec-tion, thereby tending to close the valve 12. Thisvalve is closed for the purpose of stopping the engine, and the rod 17 is normally held in its elevated position, so as to retain the valve in its open posit-ion. f f

The upper end of the operating rod 17 extends.` through a horizontally movable latch member 21 (Figs. II and IV) slidably mounted in the guide 22.] The ope-rating rodi 17 is notched to provide a shoulder 23 which normally rests upon the latch member 21 to retain the rod 17 in its elevated position. 24 designates a spring whereby the latch member 21 is. yieldingly held in the position shown by Figs. II and. IV, so as t-o retain said latch member in engagement with the operating rod 17. The latch member 21 may be shifted to the left from the lposition shown by F ig. II, and in this event the operating rod 17 will be released and lforced ldownwardly by the spring 20, thereby operatingtl'ie lever' 14 (Fig. I), link 16 and valve handle 13, to close the valve 12.

The means for releasing the locking member 21 includes a double action cam C adjustably mounted on a threaded rod 25 and provided with tapering` cam faces 26 and 27 whichare shown in Fig. II. This cam device extends through the locking member' 2l, and the latter is provided with inclined faces which lie adjacent to the cam faces 26 and 27.' The cam C is slidab-ly mounted in the guide 22, andit may be moved vertically for the pu-rpose of transmitting movement to the locking member 21. VvThen the cam vC is moved downwardly from the' position shown by Fig'. AII, its cam face 26 will engagelone of the inclines on the locking member 21, so as to move the latter to the left, vthereby releasing the vertical operating'rod 17to stop the engine. lVhen the cam C is moved upwardly from the position shown `by Fig. II, itsv cam face 27 will engage the locking` member 21 to release the operating rod- 17. It will now be understood that the cam C, including the cam faces 26and 27, may be moved either upwardly or downwardly, and that the engine will be stopped in response to either of these movements. y f

The means for operating the canrCincludes ari-operating lever 28 fulcrumed on a rod 29, and a weight 30 adjustably mounted'on said lever. rlhe cam holding rod 25 is connected to the, operating lever 28 through the .medium of links 29. The weightv 30 tends to move th-e operating lever in a downward direction, thereby tending to imparta corresponding` movement to the cam C. Under certain cond-itions to be hereinafter pointed out, the

weight 30 is permitted to actuate the lever 28 for the purpose of operating the cam C to stop the engine, and under other conditions tbe lever 28 is elevated with the result of lifting the cam Cto stop the engine.

The means for lifting the operating lever 28 includes a vertically movable thrust rod 31 engaging the lower edge of lever 28 and seated upon the top of a plunger 32 (Fig. V) the latter being mounted in a cylinder 33. As shown by Figs. I and V, a fluid conducting pipe 34 leads from the discharge pipe 1 of the pump to the cylinder33, 'for the purpose of transmitting pressure from the pump to the plunger 32 whereby the thrust rod 31 is actuated.l In response to an abnormally high pressure in the. discharge line 1 of the pump, the plunger 32 (Fig. V) will rise in the cylinder 33 thereby lifting' the operating lever 28 and cam C so as to release the locking member 21 from the vertical operating rod 17 Vfhen the pressure in the discharge line 1 drops to a predetermined low degree, there will be a corresponding reduction of the fluid pressure in the small cylinder 33 (Fig. V) and a weight 30 will then move the operating lever 28 in a.v downward direction, with the result of imparting a corresponding movement to the cam C.

Briefly stated, the operation of the device is as follows: Y

l/Vhen the valve 10 (Fig. I) in the discharge line of the pump is closed, or when the outgoing fluid is otherwise obstructed or retarded, the fluid pressureat the discharge side of the pump will rise very rapidly, and since this pressure is transmitted through the pipe 34 to the cylinder 33 (Fig. V) the piston 32 and thrust rod 31 will' move upwardly to lift the weighted operating leverV 28 and cam C, thereby causing the cam face 27 (Fig. II) to engage the locking member 21 which is thus moved tothe left from the position 'shown by Fig. II. The locking member is thus released from the shoulder 23 in the vertical operating rod 17, permittingthe spring 2O to impart a downward thrust to rod 17, whichV actuates the lever 14 (Fig.V I), link 16 and valve handle 13 to close the valve 12, whereby the engine is stopped to stop the pump. The pump is also stopped inv response to a substantial reduction of the pressure in the discharge line 1, and such reduction in pressure-may result from accidental leakage of the oil, or other fluid, passing from the pump. Under normal operating conditions, the` fluid pressure in the discharge pipe 1 and pipe 34 is great enough to retain the weightedV lever 28 in an approximately horizontal position, shown by Fig. V. vWhen this pressure drops to a predetermined low degree, the weighted lever 28 kwill move downwardly and impart a corresponding movement to the thrustfrod'vl and piston 32, atfthesame time -imparting a .-dorwnwardi movement to the cam C, wherebythe cam facey 26 `(Fig.` II) is engaged with the lockingl member -21l to shift thelatt'er to the Ileft from the posi-` tion shown by Fig. II; This willrelease the vertical operating rod 17 tostop lthe engine. To startV the fengine afterit' has* been stopped by' the automatic device, it is necessary to open the valve v12 (Fig. I), and to accomplish this the vertical operating rod 17 should be shifted tolits elevated position, shown by Fig. II,S and it should beY held thereby means ofthe locking member 21.v

After the operating lever 28 hasgmoved downwardly, it can be lifted by hand for the purpose of -elevating the-'cam .C and thereby permitting thelocking. member 21 to engage the verticalv operating rod 17, and after the ope-rating lever28 has been lifted,

' it can be held by a manually operable retaining device `comprising a stop lever 35 (Fig. V) pivoted to the'lever 28 and adapted to frictionally kengage a stationary abutment 36. In this event, a yspring 38] (Fig. V) kwill tend to disengage the stop lever 35 from the abutment 36, and .afterl the vleverl 28'lhasbeenlifted a slightdistance through l the medium of Huid pressurelin the'cylinder 33 (Fig. V), .the spring 38. will. shift the stop lever 35 to an ineffective position shown by Fig. V, where it vwill not interfere 'with the automatic operation of lever 28.

"'The fluid. escaping past the smallpiston 32 (Figr V) will be discharged through a Pipe-39.Y l 'f j Thek operating lever .28. (Fig. V) ymoves in response to variations in the fluid pressure, and I desire to preventl undue vibration of this lever, so as to stabilize .the automatic mechanism. V-In Fig. V, 40- designates a compression spring interposedV between the head ofa plunger 41 and a spring seat 42,.the latter'- being adjustably mounted in the stationary'part ofthe apparatus. The upper end of the plunger 41 is provided with a convex face which-'engages the lowen edge of lever 28. I 43 designates acompression-spring engaging a-spring seat 44 at the lower end of a' rod 45, the latter `being connected to the lever 28 through the medium of links 46. The spring-43ftends -to movek the llever 28 downwardlyw'hile Athe spring40 tendsto move the lever upwardly, so lthese oppositely acting springs'tend to prevent vibrationvof theV weighted lever 28. It is "to be .understood that the' `weight 30, l.considered alone can be lifted a predetermined degree,` of power, and afterit vhas'been placed in motion by suchpower, theweight will move an indefinite distanceunless there is some obstruction, orthe like, vtending to limit the motion. Aheli'calspring, such; as the -spring 40 or the 'spring 43,will offer,y a graduallyiincreasing resistance f to any forces tending to compress the spring. Therefore, when the weighted lever kis thrown upwardly, the spring 43 will offer a gradually increasing resistance. to the lever, and thereby Vprevent' undue upward motion of the' lever. AIn a similar manner, the spring 40 offers a gradually increasing resistance to the downward motionof the weighted lever` 28. By combining the springs 40 and V43 with the operatinglever 28, as herein shownfsaid springs tendto'retain the lever 28 Lin an ineffective position,- shown byFig. V,'1thereby tending. to prevent undue vibrations' whichy would otherwise result from slight changes in the fluid' pressure at the small pist-on 32. The thrust rod 3l (Figs. III and V) engages the operating lever 28 in a peculiar manner, and cooperates with the springsin preventingundue motion of said lever. Y The upper end; of thrust rod 31 is provided with a convex abutment face 31" which engages the lower edge of the lever 28. This curved abutment face pro'- .vides points of contact at different distances from the fulcrum 29'of the lever 28.- When the thrust rod 31 occupies its lowest position as yindicated. by dotted lines in Fig. III, rits curved 'face' 31 engages the lever 28 ata point 'remote from'the fulcrum 29, and when v constantly increasingdegree of power will be Arequired to lift the weighted'lever`28.

So the thrust rod 31 having the convex face A' 31 cooperates withthe springs 140 and 43 toprevent undue motion of the operating lever 28.

l,Iclaimz 1 f 5 Ina pumping apparatus comprising `a pump and amotor for actuating same,anau tomatic stopping device whereby said pump is stopped in response to predetermined high and low pressures, said automatic stopping device including operating means controlled bylthe fluid pressurey transmitted from the pump, and said Ioperating mean-s including an operating member movable in one direction tostopthe pump in response to a high pressurey and movable in the opposite direction to stop the .pump in response to a reduction in the pressure,vyielding means tending to move said operating member in vopposite directions, ,a weight tending to movev -said operating member in one of said directions, a-A pressure-responsive device adapted tozmove said operating member.- in

the opposite direction to stop the pump in^` response to a reduction in the pressure, springs tending to move said operating lever in opposite directions, a weight tending to move said operating Alever in one of said directions, a pressure-responsive thrust member adapted to move said operating lever in the vother direction, and means whereby Huid pressure is transmitted from said pump to said thrust member.l

8. A pumping apparatus comprising a pump and an automatic stopping device therefor, said automatic stopping device comprising an operating member movable tostop the pump, springs tending to move saidy operating member in opposite directions, a pressure-responsive device adapted to move said operating member in one of said directions, means adapted to move said operating member in the otherof said di.- rections, and means whereby fluid pressure is transmitted from said pump to said-pressure-responsive device.

ll. A pumping apparatus comprising Aa pump andan automatic stopping device therefor, said, .automatic :stopping device comprising an operating lever movable to stop the pump, springs tending to move said operating lever inV opposite directions, a pressure-responsive device. adapted to move said operating lever in one of said directions, a weight tending to move said operating lever' in the other of said directions, and means whereby iuid pressure is trans` mittedfrom said pump to said pressure-responsive device. I

5. A `pumping apparatus comprising a pumpzand an automatic stopping device therefor, said automatic .stopping device comprising an operating'v lever movable to stop the pump, a pressure-responsive thrust member, means whereby said operating lever is yieldingly held in engagement with said thrust member, said thrust member having anv abutment face providing points of contact adapted to engage said lever at different distances fromthe fulcrum thereof, and means whereby fluid .pressure is-transmitted from said pump to said thrust member.

6. A pumping apparatus comprising a pump and an Yautomatic stoppeng, device therefor, ,saidf automatic'. stopping vdevice comprising an operating lever movable to stop the pump, a pressure-responsive thrust member, means whereby said loperating lever is yieldingly held in engagement with said thrust member, said thrust member having .a

curved abutment face providing points of contact for said lever atdifferent distances from the fulcrum thereof, and mea-ns whereby fluid pressure is transmitted from, said pump to said thrust member. i

' 7. A pumping,V apparatus comprising a pump. and an automatic stopping device therefor, said 'automatic stopping device including an operating lever movable to stop the pump, springs tending to move said operating lever in .opposite directions, a pressure-responsive device including y a thrust member adapted to move said operating lever in one of said directions, said thrust member being movable in a line at an angle tothe path of said lever so as to ensaid lever at different distances from its fulcrum, and means whereby fluid pressure is transmitted from said pump t-o said pressure-responsive device.

8. A pumping yapparatus comprising a pump and an automatic sto-pping device therefor, said automatic stopping device including an'operating member movable to stop vthe pump, yielding means tendingto actuate said operating member, a holder .whereby said operating member is normally secured, and av pressure-responsive device whereby said holder is shifted to release said operating member, said pressure responsive device comprising apair of actuating ele'- ments movable in opposite directions in yre.- sponse to-high and low pressure so as to engage and actuate said ho-lder.

9. A pumping apparatus comprising a pump and an automatic stopping device therefor, said automaticv stopping device including an operating member movableto stop the pump, yielding means tending to move said operatingmember, a holder including a latch member whereby saidoperating member is normally secured, and a pressure-responsive device comprising oppositely disposed cams whereby said latch member is shifted to `release said operating member.

l0. In a pumping apparatus comprising a pump and a motor for actuating same, an automat-ic stopping device whereby said pump is stopped in response to predeterminedhigh and low pressure said automaticL stopping device including operating means controlled by the fluid pressure transmitted from the pump, said operating means including a. trippable operating member movable in oneV direction to stop the pump, yielding meansV tending to actuat-el saidvtrippable operating member, alatch memberwhereby said operating member is normally secured,

lll5

ber in its operative position, a doubleaction cam movable in opposite directions and adapted to release said latch member in response to a movement in either direction, a lever to which said cam is secured, springs tending to move said lever in 0pposite directions Aabout the axis otits fulcrum, a weight tending to move said lever in one of said directions, a pressure-responsive thrust member opposing said weight and y adapted to movesaid lever in the opposite direct-ion, said thrust member having a curved abutment face providing diiferent points of contact for said lever, and means whereby fluid pressure is transmit-ted from said pump to said thrust member.

11. A pumping apparatus comprising a pump and an automatic stopping device therefor, said automatic stopping .device including an operating member movable to stop the pump, a pressure-responsive device acting on said operating member to normally hold the same in an ineffective position, means tending to move said operating member to stop the pump, and a manually operable retaining device adapted to hold said operating member in an ineffective position.

12. A pumping apparatus comprising; a pump and an automatic stopping device therefor, said automatic stopping device including an operating member movable to stop the pump, a pressure-responsive device whereby said operating member is normally held in an ineffective position, means tending to move said operating member to stop the pump, andv a manually operable retaining device adapted to hold said o-perating member in an ineffective position, said retaining device comprising a stop Jfor limiting the motion of said operating member, and a spring tending to retain said stop in an inoperative position..

13. A pumping apparat-.us comprising a pump and an automatic Y stopping device therefor, said automatic stopping device including a weighted operating lever movable to stop the pump, a pressure-responsive device whereby said operating lever is normally held in an ineffective position, and a manually operable retaining device adapted to hold said operating lever in an ineffective position, said retaining device comprising a stop member pivoted to said lever, an abutvment cooperating with said stop member to limit the motion of said lever and a spring tending to displace said stop member from said abutment.

In testimony'that I claim the Jforegoing I hereunto affix my signature.

REINHARD HILDEBRAND. 

